Connections Between Inclusive and Exclusive Semileptonic B Decay

Details Connections Between Inclusive and Exclusive Semileptonic B Decay Connections Between Inclusive and Exclusive Semileptonic B Decay

1997-03-07

arxiv.org/abs/hep-ph/9703269v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, Talk given at the Latin American Symposium on High Energy Physics, Merida, Mexico, 1996

Scientific paper

10.1063/1.53254

B decay sum rules relate exclusive B semileptonic decay matrix elements to forward B-meson matrix elements of operators in HQET. At leading order the operators that occur are the b-quark kinetic energy $\lambda_1$ and chromomagnetic energy $\lambda_2$. The latter is determined by the measured $B^*-B$ mass splitting. The derivation of these sum rules is reviewed and perturbative QCD corrections are discussed. A determination of $\lambda_1$ and the energy of the light degrees of freedom in a B-meson, $\bar\Lambda$, from semileptonic B decay data is presented. Future prospects for improving these sum rules are discussed.

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